I'd say $37,000 would be a good starting point and work your way up if he doesn't go for it. I'm trading my 2008 M3 with 41,500 miles on it that has everything you mentioned in your deal, but mine has DCT and doesn't have heated seats and I am getting $34,000 (+2,700 in tax benefits towards the trade). Mine was in a very small accident and had to have the rear bumper replaced, so that definitely hurt me. Being that I look at the total price I'm paying as opposed to the sale price + tax, I'm getting close to $37,000 (despite lower miles and a small accident on the VIN report). Definitely check on the tire tread too, that could be a factor in your offer if they aren't in good condition. Sorry for the stupid rambling... i gotta case of the mondays. hope that gives you some context for your offer